Andrea, an Oprah Show producer, chats with Oprah and Bob Greene onstage during the taping of Oprah and Bob's Best Life Challenge.
Dr. Christiane Northrup explains why increasing your vitamin D intake could help prevent breast cancer.
Watch Oprah.com's bioidentical hormone webcast with Dr. Christiane Northrup.
Through her personal story and many fascinating case histories, Dr. Northrup shows women how to make menopause a time of personal empowerment and positive energy.
Oprah and Bob Greene are challenging America to sign up to get fit and commit to losing weight in 2008 with help from Bob's Best Life Diet.